警报信号

动物在交流时经常会对彼此发出警報信號，用来信号警示周围的同类附近存在的威胁。这是一种反捕食者适应，广泛存在于社会性动物中。许多灵长类和鸟类有复杂的警告声音。鱼和昆虫则会采用声音以外的方式，比如释放。

外部链接 
Chickadees' alarm-call carry information about size, threat of predator 
The Trek of the Pika  "A story complete with sounds of pika and marmot calls" 2002-10-30
Characteristics of arctic ground squirrel alarm calls Oecologia Volume 7, Number 2 / June, 1971
Why do Yellow-bellied Marmots Call?  Daniel T. Blumstein & Kenneth B. Armitage
Department of Systematics and Ecology, University of Kansas 
Alarm calls of Belding's ground squirrels to aerial predators: nepotism or self-preservation?

動物交流
反捕适应
应急通信
生存技巧